Portable ashtray



FIG. 1 is an enlarged front perspective view of a portable ashtray with the lid open showing my new design;

FIG. 2 is a rear view thereof with the lid closed;

FIG. 3 is a right side view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a top view thereof; and,

FIG. 6 is a bottom view thereof. 

The ornamental design for a portable ashtray, as shown and described. 